package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /*
     * 添加购物车
     * */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(userId);

        //判断当前插入到购物车中的商品是否已经存在
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果存在,如果存在,只需要将数量加1
        if (list != null && list.size() > 0) {
            ShoppingCart shoppingCart1 = list.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
        } else {
            //如果不存在,需要插入一条购物车数据

            //先判断这次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCart.getDishId();

            if (dishId != null) {
                //本次添加的是菜品
                Dish dish = dishMapper.selectById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());


            } else {
                //本次添加的是套餐
                Setmeal setmeal = setmealMapper.selectById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());

            }

            //添加数据
            shoppingCartMapper.insert(shoppingCart);


        }


    }

    /*
     * 查看购物车
     * */
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /*
     *清空购物车--删除自己的购物车
     * */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /*
     * 删除购物车中的一个商品
     * */
    public void deleteOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //先查询这个商品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number == 1) {
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
